05000346/LER-1979-073-03, /03L-0 on 790708:during Checkout of Valve Relay, Main Steam Inlet to Auxiliary Feed Pipe Turbine 1-1 Isolation Valve Torqued While Opening.Caused by Normal Valve Wear.Valve Was Readjusted & Returned to Svc

/03L-0 on 790708:during Checkout of Valve Relay, Main Steam Inlet to Auxiliary Feed Pipe Turbine 1-1 Isolation Valve Torqued While Opening.Caused by Normal Valve Wear.Valve Was Readjusted & Returned to Svc

ML19242A846
Person / Time
Site:	Davis Besse
Issue date:	08/02/1979
From:	Oneill J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19242A845	List: 05000346/LER-1979-073, Forwards LER 79-073/03L-0 05000346/LER-1979-073-03, /03L-0 on 790708:during Checkout of Valve Relay, Main Steam Inlet to Auxiliary Feed Pipe Turbine 1-1 Isolation Valve Torqued While Opening.Caused by Normal Valve Wear.Valve Was Readjusted & Returned to Svc
References
LER-79-073-03L, LER-79-73-3L, NUDOCS 7908060455
Download: ML19242A846 (2)

LER-1979-073, /03L-0 on 790708:during Checkout of Valve Relay, Main Steam Inlet to Auxiliary Feed Pipe Turbine 1-1 Isolation Valve Torqued While Opening.Caused by Normal Valve Wear.Valve Was Readjusted & Returned to Svc

Event date:
Report date:
3461979073R03 - NRC Website

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J U. S. NUCLE AG T'EGUL ATORY COMMISSION

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L VENT DESCRIP'lO') nND PHOB ABLE CONSLGUENCE S h 1979, during a checkout of a relay in the motor operator control circuit of lOn July 8, n

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gg l valve MS-106, "Ma in Steam Inlet valve was declared inoperable at 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br />, placing g j jtorqued out while opening.

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION l;IT ONE SUPPLEMENTAL INFOP3t\\T10N FOR LE'1 SP-33-7 9-83 DATE OF EVENT: July 8, 1979 JACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRErE - Main Steam line to Auxiliary Feed Pump Turbine 1-1 steam inlet isolation val MS-106 failed to operate properly.

The unit was in Mode 3, with Power (3P..T) = 0, and Conditions Prior to Occurrer.ce:

Load (Gross MUE) = 0.

Description of Occurrence: On July 8, 1979, during checkout of the relay in the notor operator control circuit of valve MS-106, " Main Stean Inlet to 'uxiliary Feed Punn Turbine (A FPT) 1-1 Isola t ion Valve", MS-106 torqued cut while openin;; c.nd was d.:clared inoperable at 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br />. This placed the unit in the Action Statercat of Technical Specif ir.ation 3.7.1.2 which requires two independent Auxiliary Feedwater Trains t>

be operable in Modes 1, 2, and 3.

Designation of Appgirent Cause of Occurrence r The apparent cause of this problea is beli."'ad en h"

d"o en normal we:1r of the valve in t e r na l parts wnich nade it acce s.>a t s to increase the torque switch setting slightly.

Analysis of Occurrence: There was no danger to the health and saf ety of the public or to station personnel. The unit had been shutdown since ': arch 31, 1979, and throughout this occurrence. Auxiliary Feedwater Train 2 was operable at the time of this occurroace.

Corrective Ac tion:

Under Maintenance Work Order (3F.?O) 79-2461, the notor operator was removed, inspected and reinstalled. The open torque switch settira was increased from 1.9 to 2.5.

The valve was stroked twice and opera ted properly However, when opera-tions personnel attempted to stroke the valve, it torqued eut while going closed.

'dainten-ance personnel then decreased the open torque switc settin" of the valve to 2.4 and made a slight adj ustm ent to the open limit switch in order to keep it closed longer when the valve is moving of f its back seat.

The valve was stroked twice

':5-lC'6 wa s t hen testcd per against fell differential pressure and operated properly.

ST 5071.01, " Auxiliary Feedwater System Monthly Test", and was declared ope ra-ble on July 10, 1979.

A Maintenance Work Order has been written to inspect MS-106 internally at the refueling outage.

Failure Data: A previous inoperability of valve MS-106 was reported in Licensee Event Report NP-33-79-03.

This previous incident was caused by a dirt buildup on the valve stem.

LER #79-073 i :

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